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Merge branch 'development-restricted'

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Conflicts:
	ChangeLog
This commit is contained in:
Simon Butcher 2016-10-13 13:33:29 +01:00
parent 4d69ecd9cb d5766f62e4
commit bb42068a91
4 changed files with 38 additions and 2 deletions
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6
ChangeLog
View file

@ -2,6 +2,12 @@ mbed TLS ChangeLog (Sorted per branch, date)
= mbed TLS 2.3.x branch released 2016-xx-xx
Security
* Fix potential stack corruption in mbedtls_x509write_crt_der() and
mbedtls_x509write_csr_der() when the signature is copied to the buffer
without checking whether there is enough space in the destination. The
issue cannot be triggered remotely. (found by Jethro Beekman)
Features
* Added support for CMAC for AES and 3DES and AES-CMAC-PRF-128, as defined by
NIST SP 800-38B, RFC-4493 and RFC-4615.

3
library/x509write_crt.c
View file

@ -413,6 +413,9 @@ int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf,
MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
sig_oid, sig_oid_len, sig, sig_len ) );
if( len > (size_t)( c2 - buf ) )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
c2 -= len;
memcpy( c2, c, len );

3
library/x509write_csr.c
View file

@ -213,6 +213,9 @@ int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, s
MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
sig_oid, sig_oid_len, sig, sig_len ) );
if( len > (size_t)( c2 - buf ) )
return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
c2 -= len;
memcpy( c2, c, len );

28
tests/suites/test_suite_x509write.function
View file

@ -16,10 +16,11 @@ void x509_csr_check( char *key_file, char *cert_req_check_file,
{
mbedtls_pk_context key;
mbedtls_x509write_csr req;
unsigned char buf[4000];
unsigned char buf[4096];
unsigned char check_buf[4000];
int ret;
size_t olen = 0, pem_len = 0;
int der_len = -1;
FILE *f;
const char *subject_name = "C=NL,O=PolarSSL,CN=PolarSSL Server 1";
rnd_pseudo_info rnd_info;
@ -52,6 +53,17 @@ void x509_csr_check( char *key_file, char *cert_req_check_file,
TEST_ASSERT( olen >= pem_len - 1 );
TEST_ASSERT( memcmp( buf, check_buf, pem_len - 1 ) == 0 );
der_len = mbedtls_x509write_csr_der( &req, buf, sizeof( buf ),
rnd_pseudo_rand, &rnd_info );
TEST_ASSERT( der_len >= 0 );
if( der_len == 0 )
goto exit;
ret = mbedtls_x509write_csr_der( &req, buf, (size_t)( der_len - 1 ),
rnd_pseudo_rand, &rnd_info );
TEST_ASSERT( ret == MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
exit:
mbedtls_x509write_csr_free( &req );
mbedtls_pk_free( &key );
@ -68,11 +80,12 @@ void x509_crt_check( char *subject_key_file, char *subject_pwd,
{
mbedtls_pk_context subject_key, issuer_key;
mbedtls_x509write_cert crt;
unsigned char buf[4000];
unsigned char buf[4096];
unsigned char check_buf[5000];
mbedtls_mpi serial;
int ret;
size_t olen = 0, pem_len = 0;
int der_len = -1;
FILE *f;
rnd_pseudo_info rnd_info;
@ -125,6 +138,17 @@ void x509_crt_check( char *subject_key_file, char *subject_pwd,
TEST_ASSERT( olen >= pem_len - 1 );
TEST_ASSERT( memcmp( buf, check_buf, pem_len - 1 ) == 0 );
der_len = mbedtls_x509write_crt_der( &crt, buf, sizeof( buf ),
rnd_pseudo_rand, &rnd_info );
TEST_ASSERT( der_len >= 0 );
if( der_len == 0 )
goto exit;
ret = mbedtls_x509write_crt_der( &crt, buf, (size_t)( der_len - 1 ),
rnd_pseudo_rand, &rnd_info );
TEST_ASSERT( ret == MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
exit:
mbedtls_x509write_crt_free( &crt );
mbedtls_pk_free( &issuer_key );